Calculating strike water temp - HELP - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > Brew Science > Calculating strike water temp - HELP

Reply
 
Thread Tools
Old 02-16-2011, 05:39 AM   #1
promontory
Recipes 
 
Jan 2009
Bothell, WA, WA
Posts: 87
Liked 1 Times on 1 Posts



I saw other threads but I am having a tough time figuring this out.

Initial Infusion Equation:
Strike Water Temperature Tw = (.2/r)(T2 - T1) + T2

where:
r = The ratio of water to grain in quarts per pound.
11.875 lbs of grain (divided by) 3.7 gal (1.25 gt per lb) = .31


T1 = The initial temperature (F) of the mash.
60'

T2 = The target temperature (F) of the mash.
165'

Tw = The actual temperature (F) of the infusion water.


So: (.2 / .31 = .64)(165 -60 = 105) + 165
So: .64 x 105 +165
So: 67.5 +165 = 200+... That can't be right... What am I doing wrong???

 
Reply With Quote
Old 02-16-2011, 06:57 AM   #2
downinit
Recipes 
 
Jan 2010
Salt Lake City, Utah
Posts: 88

in your equation r should be 1.25 not .31
__________________
Primary: Wheat Porter
Secondary:
Kegged: Scottish Wee Heavy
Pale Ale

 
Reply With Quote
Old 02-16-2011, 03:00 PM   #3
promontory
Recipes 
 
Jan 2009
Bothell, WA, WA
Posts: 87
Liked 1 Times on 1 Posts


Thanks for the note on that one. That still leaves my strike water temp at 182'. Isn't that a little high? or is that accounting for heat loss due to the added grain?

 
Reply With Quote
Old 02-17-2011, 12:38 AM   #4
ajf
Senior Member
HBT_LIFETIMESUPPORTER.png
 
ajf's Avatar
Recipes 
 
Oct 2005
Long Island
Posts: 4,646
Liked 105 Times on 99 Posts


I agree that r should be between 1 and 2, and 1.25 is a good starting point
But surely you're not going to mash at 165. 154 seems to be a reasonable value
So: (.2 / 1.25 = .16)(154 - 60 = 94) + 154
So:.16 * 94 + 154 = 169

That looks pretty reasonable to me.
-a.
__________________
There are only 10 types of people in this world. Those that understand binary, and those that don't.

 
Reply With Quote
Old 02-17-2011, 03:55 PM   #5
promontory
Recipes 
 
Jan 2009
Bothell, WA, WA
Posts: 87
Liked 1 Times on 1 Posts


http://www.garagebrewers.com/forum/topic?f=14&t=1072 is the recipe I have planned to follow... Guy says its legit. I know not to believe everything I read... but

thanks for the notes.

 
Reply With Quote
Old 02-17-2011, 04:17 PM   #6
ChowderMonkey
Recipes 
 
Nov 2008
Posts: 5

I see a mash temp of 156 vs 165. Which is a perfectly reasonable temp for a full bodied beer.

 
Reply With Quote
Old 02-17-2011, 04:18 PM   #7
promontory
Recipes 
 
Jan 2009
Bothell, WA, WA
Posts: 87
Liked 1 Times on 1 Posts


hi dyslexia how are you! sorry everyone, AJF as exactly right...

 
Reply With Quote


Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Calculating strike temp TurboBrew Brew Science 13 01-23-2012 06:51 PM
calculating SG of first runnings JLem Brew Science 4 07-22-2010 07:17 PM
new mash tun - adjust strike water temp? JLem Brew Science 9 01-19-2010 03:36 PM
What Temp Is Ice Water? HenryHill Brew Science 21 09-14-2009 10:02 PM


Forum Jump